Saw-sharpener.



F. A. BREEZE.

SAW SHARPENER.

APPLICATION FILED JUNE 16, 1913 3 SHEETS-SHEET 1.

Patented Mar. 3, 1914.

Frank Alweeze COLUMBIA PLANOGHAPH C0WAIHINCITON. D. c.

P. A. BREEZE.

SAW SHARPENBR.

APPLICATION TILED JUNE 10, 1913.

1,089,312, Patented Mar. 3, 1914.

' 3 SHEETS-SHEET 2.

II E. E

5 57 g f at x 5'53 52 D540 i a 3' atliouuu COLUMBIA PLANOGRAPM co WASHINGTON. c.

lhlll ll FRANK A. BREEZE, OF NEWBURGI-I, ONTARIO, CANADA.

SAW-SHARPENER.

To aZZ w hom it may concern Be it known that I, FRANK A. BREEZE, a subject of the King of Great Britain, residing at Newburgh, in the county of Lennox and Addington and Province of Ontario, Canada, have invented certain new and useful Improvements in Saw-Sharpen ers; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to grinding machines, and more especially to those intended for grinding edge tools; and the object of the same is to produce an extremely simple machine for sharpening band saws of various widths and thicknesses and having teeth differently spaced and set at different angles, for all of which conditions the machine has proper adjustments provided. This and other objects are accomplished by constructing the machine in the manner hereinafter more fully described and claimed, and as shown in the drawings wherein Figure l is a front elevation, and Fig. 2 a plan view of this machine complete. Fig. 3 is a cross section on the line 3-3 of Fig. 1. Fig. 4 is a detail in section on the line 4- 1 of Fig. 1, and Fig. 5 is a sectional detail of the means for adjusting the outer member of the carriage. Fig. 6 is an enlarged perspective detail of one of the antifriction devices within said carriage. Fig. 7 is a collective perspective view of the slide and the saw-feeding mechanism connected therewith, the various parts being slightly separated from each other. Fig. 8 is a side elevation, on an enlarged scale, giving a detail of the friction drive mechanism, and Fig. 9 is a perspective detail of the driving pulley thereof.

In the drawings the numerals 1 designate legs supporting a table or bed 2, in bearings 3 011 which is mounted a power shaft 4 having on one extremity fast and loose pulleys 5 by which it receives power in the usual manner, and this shaft also carries a worm 6 engaging a worm gear 7 on a crank shaft 8 mounted in other hearings on the bed as shown. At what might be called the front end of the last-named shaft is a disk 9 pro vided with a cross slot 10 in which is adjustably mounted a crank pin 11 from which leads a pitman 12 connected with an car 13 Specification of Letters Patent.

Application filed June 16, 1913.

Patented Mar. 3, 1914.

Serial No. 773,998.

on a slide 14:. The latter is suitably guided on the bed and moves alongside the saw whlch in turn rests on a saw support 15 rendered vertically adjustable by means of a set screw 16 as shown. it saw clamp 17 is carried by a yoke 18 whose feet are pivoted at 19 to the bed and whose upper port1on is borne normally toward the saw by means of a spring 20, and it is the purpose of this clamp to hold the saw against one edge of the bed after it has been adjusted by the feeding mechanism next to be described.

Pivoted at 21 to the slide let is an arm 22, to whose upper end at 23 in turn is pivoted a finger 2d, and the arm is set farther forward by means of a hand screw 25 which passes through a threaded eye 26 at the up per end of the car 13 and is held after adjustment by means of a jam nut 27. Through the outer end of the linger is slidably mounted a pin 28 pressed normally toward the saw by a spring 29, and the tip of the pin is beveled so that as the feed mechanism moves to the rear the pin disengages the notch between two teeth and slides across one tooth and is spring-pressed into the notch between the next two teeth.

By the construction just described, the rotation of the power shaft is communicated to the crank shaft through the worm and worm wheel, and the crank shaft through its pitman reciprocates the slide 1% to an extent dependent upon the setting of the crank pin in the slot 10 of the disk As the slide and the parts carried therebymove forward, the pin pushes the saw forward for the distance of one tooth where it is held by the clamp above described, and as the slide is drawn to the rear the pin disengages the saw and slides across one face thereof into engagement with the next tooth so that on a subsequent forward movement the saw will again be fed for a like distance. Adjustment of the hand screw 25 changes the path through which the pin moves, but the throw of the pin in its movement must be regulated by adjusting the crank pin in the slot 10. When the saw is to be removed and replaced by another one to be sharpened, the spring 20 can be turned aside and the entire clamp 17 swung downward on its pivots 19 so as to be out of the way, and obviously this clamp will. accommodate a saw blade which is thinner or thicker. is to the width of the saw blade, the support 15 can be adjusted vertically by means of the set screw 16 in a manner which needs no further explanation.

The grinder 30 may be of emery or other suitable abrading material. It is mounted on an arbor 31 under a nut 32 at the lower end of said arbor and between said nut and a cup-shaped collar 83 which catches grease from the bearings 33% in which the arbor is journaled, and on said arbor between the bearings are two pulleys 35 by means of wnich rotary power is communicated to it. Above the uppermost bearing an expansive spring surrounds the arbor under a nut- 37, so that the tendency of this spring is to ever draw the arbor and grinder upward. The bearings are carried by a frame 38 which is provided with slots 39 struck on arcs around the point where the grinding is to occur. 7

The carriage which supports the grinder and frame in which the grinder is journaled, is itself made of two members, the foremost of which, e0, has screws il engaging said slots 39 in the frame so that the latter can be adjusted with respect to this member. The rearmost member, 42, in turn has a similar slot-and-screw adjustment 4-3 with a bracket ts: which rises from the bed 2, all of which is for a purpose hereinafter to appear. Between said two members are ant-ifriction devices, herein shown as consisting of toothed wheels a5 engaging toothed racks or tracks e6 in the contiguous faces of the two members, each pair of wheels being mounted on an axle or rod 47 so as to re quire them to rotate in unison. Adjacent the toothed wheels at one side are plain wheels l-S traveling on said contiguous faces, and adjacent the toothed wheels at the other side are wheels 18 having ti-shaped faces traveling in grooved tracks 42 in said contiguous faces-the obvious purpose being to positively prevent the dislocation or disarrangement of the anti-friction devices and to cause them to rotate in unison with each other when one member is adjusted over the other in a manner yet to appear. By the adjustment referred to T do not mean the adjustment permitted by the slot-and-screw arrangement just described, but rather the automatic adjustment or more properly speak.

ing the and fall of the grinder as yet to be explained. A belt 50 leads from one of the pulleys 35 on the saw arbor to a driving pulley 51 whose shaft 52 is mounted in a bearing 53 which has a similar slot-andscrew adjus ment 54: on a bracket which rises from the rear end of the bed, so that when the members at the front end thereof are adjusted on the bracket T4 the bearing at the rear end thereof can be adjusted on the bracket 55, although under ordinary circumstances the crowning of the face of the driven pulleys 35 will be sufiicient to permit a certain slight adjustment as will be clear.

The driving pulley 51 is by preference connected with the power shaft a by means of a friction-drive mechanism best illustrated in Fig. 8 and which consists of a cupshaped member 56 whose inner wall is en gaged by the periphery of a disk 57 fast on said power shaft at; and the are on which the slots 5% are cut is such that even after adjusting the shaft 52 the friction drive will operate successfully. A wire hook con nected with said carriage leads to the rear and is connected to a spring 60 whose rear end in turn is passed through a bracket 61 and receives an adjusting nut 62 whereby the tension of the spring can be increased or diminished; and the obvious purpose of this detail is to hold the front member on the rear member of the carriage with the antifriction devices between them. When now the power shaft 4 revolves, movement is communicated through the friction-drive mechanism to the driving pulley 51, and by the latter through the belt 50 to the arbor of the grinder which is by preference an emery wheel as above suggested and which is rotated at a rapid rate of speed.

For automatically raising and lowering the forward member of the carriage so as to lift the grinder out of position between two teeth and hold it raised while the feed mechanism is advancing the saw, I provide a cam 6% on the slide let, which cam is adapted to be engaged by a roller 65 journaled on a block 66 that is suitably guided in the forward member 40 on a line substantially at right angles to the axis of the grinder-arbor. Swiveled in said block is a head 68 at the lower end of a hand screw 69 whose body engages a nut 70 that forms part of said member 10. The result is that when this screw is rotated the block is raised or lowered within its guide and the roller is adjusted higher or lower as desired. W hen now the feed mechanism is projected by the rotation of the disk 9 the first action of said cam is to engage the roller and raise the forward member of the carriage which of course carries the frame 38 with it, and the frame in turn carries the arbor and the grinder 30. The shape of said cam is such that it raises the g'inder slowly and the beveled edge of the latter grinds the back of the tooth next in rear of that tooth just ground, and meanwhile the continued forward movement of the slide 14-, through the finger 2d and pin carried by it, moves the band saw along upon the support 15 beneath the clamp 17. When the crank pin in the disk 10 has reached the forward limit of its movement, the parts commence a return movement and in doing so the pin at the front end of the finger 2 1 disengages the notch between two teeth as its spring permits and therefore leaves the saw in its advanced position, while the face of the cam 64 permits the descent of the grinder 30 which now moves downward on a proper line to grind the face or active edge of the next tooth on the saw. Thus it will be seen that the action of this machine is continuous and automatic, and that a band saw (or by slight modification, a circular saw) can be sharpened without danger to the saw, the workman, or the machine. Having properly adjusted the latter to the depth of the teeth and the distance between their points, the machine needs no further attention until the work is done, and then the sharpened saw may be quickly replaced by another which is to be treated.

YVhat is claimed as new is:

In a saw grinding machine, the combination with the bed, a saw clamp, and a sawfeeding mechanism on said bed; of a carriage made in two members adjustable over each other, toothed racks on the contiguous faces of said members and arranged in pairs standing opposite each other, a pair of toothed wheels engaging said pairs of racks, a rod connecting said wheels, a plain wheel at one end of said rod and a wheel having a V-shaped face at the other end of said rod, said contiguous faces having grooved tracks for the last-named wheels, bearings carried by the foremost member, an arbor journaled in said bearings. and carrying the grinder, means for rotating said arbor, and means for lifting the foremost carriage-member during the advance of the saw.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

FRANK A. BREEZE. Witnesses:

Geo. H. SMYTHE, ANNA HANLoN.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patentl. Washington, D. G. 

